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More fleshing out of sqlite3.capi.wasm.pstack.

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FossilOrigin-Name: eb5726677a727a958df11f1fba078d30c7c0ba2a9bdb158e8641b35b5f971af3
This commit is contained in:
stephan
2022-10-02 03:11:13 +00:00
parent 6479c5a359
commit 63e9ec2f9c
8 changed files with 205 additions and 86 deletions
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22
ext/wasm/api/sqlite3-api-prologue.js
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@ -265,6 +265,9 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
this.name = 'WasmAllocError';
}
};
WasmAllocError.toss = (...args)=>{
throw new WasmAllocError(args.join(' '));
};
/**
The main sqlite3 binding API gets installed into this object,
@ -733,6 +736,9 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
Functions which are intended solely for API-internal use by the
WASM components, not client code. These get installed into
capi.wasm.
TODO: get rid of sqlite3_wasm_vfs_unlink(). It is ill-conceived
and only rarely actually useful.
*/
capi.wasm.bindingSignatures.wasm = [
["sqlite3_wasm_vfs_unlink", "int", "string"]
@ -781,15 +787,21 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
Attempts to allocate the given number of bytes from the
pstack. On success, it zeroes out a block of memory of the
given size, adjusts the pstack pointer, and returns a pointer
to the memory. On error, returns 0. The memory must eventually
be released using restore().
to the memory. On error, returns throws a WasmAllocError. The
memory must eventually be released using restore().
This method always adjusts the given value to be a multiple
of 8 bytes because failing to do so can lead to incorrect
results when reading and writing 64-bit values from/to the WASM
heap.
*/
alloc: capi.wasm.exports.sqlite3_wasm_pstack_alloc
alloc: (n)=>{
return capi.wasm.exports.sqlite3_wasm_pstack_alloc(n)
|| WasmAllocError.toss("Could not allocate",n,
"bytes from the pstack.");
}
// More methods get added after the capi.wasm object is populated
// by WhWasmUtilInstaller.
});
/**
sqlite3.capi.wasm.pstack.pointer resolves to the current pstack
@ -828,7 +840,9 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
this.name = 'SQLite3Error';
}
};
SQLite3Error.toss = (...args)=>{
throw new SQLite3Error(args.join(' '));
};
/** State for sqlite3_wasmfs_opfs_dir(). */
let __persistentDir = undefined;